5300 Vrms isolation in a DIP-4
The onsemi H11A617B300W is a single-channel optocoupler with a transistor output, designed for signal isolation in industrial and power-control circuits. Its 5300 Vrms isolation rating separates the DC-input side from the 70 V, 50 mA output stage, providing galvanic isolation for logic-level interfaces, PLC digital inputs, and motor-drive feedback paths. The current transfer ratio (CTR) spans 63% to 125% at a forward current of 10 mA, giving the designer a predictable gain window for driving the output transistor into saturation across temperature.
onsemi has marked the H11A617B300W as obsolete. If a pin-compatible alternative is needed for a new design, the H11A817 series (same pinout, similar CTR range) is a common cross-shop candidate, though no direct replacement is guaranteed by onsemi.
Temperature range and switching speed
Rated for -55°C to 100°C operating ambient, the H11A617B300W covers industrial and extended-temperature environments. The 2.4 µs typical rise and fall times support data rates up to roughly 200 kbps — adequate for 50/60 Hz line synchronisation, relay-driver isolation, and slow opto-isolated serial links. The 1.35 V typical forward voltage at 10 mA forward current is standard for a GaAs IR LED. The 50 mA absolute maximum forward current means the LED can be driven from a 5 V logic output through a 360 Ω resistor without exceeding the rating.